Fbancis w



(No Model.)

P. W. JONES;

MEANS FOR OVERCOMING STATI() TROUBLES IN TELEGRAPES.

PatentedAug. 26, 1884.

Nimm

Unirse STATES Partnr @trices FRANCIS YV. JONES, OF NEYV YORK, N. Y.

MEANS FOR OVERCOMING STATIC TROUBLES EN TELEGRAPHS.

:SPECIFICATION forming part of Letters Patent No. 304,106, dated August 26, 1884:.

Applicationiled August 20, 1683. (No model.)

practical operation ot' this system the correct reception of the signals from the distant station is more or less interfered with and obstructed by false signals, which are produced upon the receiving instrument or instruments at the home station by momentary charges and discharges of static and induced electricity, which pass to and from the main line at the instant a connection is established between the battery and the main line, or between said line and the earth, by means of the lteys or transmitters. These effects are especially troublesome when theline (if it be aland line) is of considerable length and well insulated, and also when a submarine cable constitutes the whole ora considerable portion of the conductor.

In myprior Letters Patent- No. 260,208, dated June 27, 1882, I have described and claimed an organization ot' apparatus for neutralizing the injurious effects of static charge and discharge upon the apparatus at the home station, which organization consists, essentially, of a branch line returning directly to the earth at the home station, in combination with a receiving-instrument wound with two independent assisting coils, one of which is included in the main and the other in the branch line, and

an inductor or core ot' soft iron surrounded by combined magnetizing effects oi' the main-linccoil and the assisting coil thereupon shall be exactly neutralized by the equa-l and opposite effect of the coil included in the ,artilicial line. By this means I am enabled to apply the-'same principle of operation to any of the ordinary differential systems of duplex or quadruple-X telegraphy.

I have hereinafter shown and described my invention as applied to a quadruplex system of transmission; but it is equally applicable to the more simple duplex system, and may be applied thereto without diiculty by persons skilled in the art to which the invention appertains.

in applying my invention to a quadruplex system I prefer to employ, in connection with electric currents of a given polarity and havl 'ing determinate relative strengths, two dif fcrential electromagnetic relays, constructed to respond to incoming` electric currents, and to cause to .be actuated either one or both of two local or secondary receiving-instruments, according to the relative strengths ofthe currents received. The differential electro-magnets are each constructed with three independent helices or coils of wire, two of which are wound in the same direction and have an aggregate magnetizing capacity equal but opposite to that of the third coil, which is wound in the opposite direction. The conductor forming the single opposing helix upon each electro-magnet extends through an adjustable rheostat to the earth and forms an artificial or equating line. One oi' the parallel conduct ors forming the double assisting helix, after traversing the electro-magnet, is likewiselconnected with the earth through an adjustable artificial resistance and one or more electromagnetic or Varlcy coils. The remaining conductor is connected with and forms a part of the main line. The secondary receiving instrument or instruments are so connected with receiving-relays and local batteries that currents of a given strength will act-nate one of the instruments, currents of a given increased strength the other only, and currents of aggregate or combined strength willactuate both instruments.

In the accompanying drawings, Figure l is a diagram illustrating the arrangement ci' apparatus at one station as applied to a quadruplex system, and showing both the transmitting and the receiving` devices, together with their electrical connections, and Fig. 2 is a diagram illustrating in det-ail the construction of the electro-magnetic inductor.

Referring' to the drawings, o and o represent two local batteries, including in their circuit the electro-magnets Maud M', respectio ively, and keys l( and K. These batteries and keys are. employed foractuating two transmitters, T and T', respectively, by closing the circuits therethroughin a manner well understood. Each ot' the transmitters T and T coni 5 sists of an armature-lever, t and t, each provided with contact-springs tt and L, normally in contact with the resting contact-stops t and h-respectively, and at the same time severing their connections with the working-contacts l* 2o and t". -The opposite poles of a main battery, E, are-respectively connected by the wires 3 and 2 with the working-contacts t* and t5. The battery E is divided into two sections, e' and c?, which are united by means of a conductor, 2 5 4, connected with the armature-levers tand t by the wires 5 and 6, respectively. The section c2 is preferably formed ot' a number of elements, giri ng it an electro-niotive force onehalt' as great as that of the section cf. The 5o contact-springs ot' the key-levers t and 'L' are respectively connected by the wire 7 through the receiving-instruments with the niain line L, and by the wire l with the earth at G.

. lt will be observed that when the apparatus 3 5 is in its normal position :no current is sent to the main line L from the battery et. It', however, the armature-lever be depressed, by

closing the circuit ofthe local battery o throughl the electro-magnet M, the contact-spring t2 4o will be brought into connection with the working-contact t", and will be raised from the resting-contact t". The circuit ofthe batterysection c2 will thereupon be closed, the negative pole being connected by the wires et and 6, key-lever t', resting-contact t7, contactspring t, and wire l with the earth at G, while the positive pole is connected by the wire 3 with the working-contact Z and contact-spring t with the wire 7, and thus through 5o therelay-instruments to the main line. lf, on V'the other hand, the key-lever t be depressed, by closing the circuit oi' the local battery o, the :nain battery-section c will be placed in connection with the main line, the negative pole heilig connected by the wire 2, workingcontact t5, contact-spring t, and wire l `with the earth at G, while the positive pole is connected by the wires t and 5 with the lever i, resting-contact i, and contact spring ti with 6o the wire 7, and thus with the main line. In this instance a current due to an electro-motive force twice as great as that when the key K is depressed will be sont to line. lfVhen both keys K and K are depressed, both batterysections are placed in circuit, the negative l I l n, working-contact f, contactspring t, and wire 1, while the positive pole ot' section cgis to line through wire 3, working-contact t, contact-spring t2, and wire 7. In this position a current will be sent to line three times as great as when the key K alone is depressed. The construction and arrangement of the receiving apparatus will now be considered. R and R represent two receiving-relays having differential electro-magnets, each electro-magnet being provided withthree coils or helices ol' insulating-wire. The terminals of the helices Ir 1" r" ot' the electro-magnet R are all connected with the wire 7, leading from the transmitting device. Two of these coils, r and 1", are wound upon the core m of the electro-magnet R in a given direction, and are respectively connected by the wires 9 and 10 with the terminals of the correspondinghelices, r a-nd i, of the second relay electro-magnet, Rf. These helices are wound inthe same direction, one of them being connected with the wire l1., leading` to the earth at G1', and including in its circuit an artificial resistance, B, and electromagnetic inductor-coils l, while the other, r", is connected with the main line L. The remaining coil, 0"", of the electro-magnet R is wound in the opposite direction from the helices r and 1", and is connected by a wire, 12, with the helix T5 of the electro-magnet R, which helix is wound in opposition to the helices 'ris and r. lt will now be readily understood that a current passing from t-he transmitting apparatus at the home station roo.

will. divide at the point S, one portion passing over the branch wire or conductor, which includes the helices r'' and ri, to the earth at C", the other portion dividing between the conductors comprising the helices r r and r rt, the portion traversing the helix r3 passing over the main line L, while that traversing the helix r* passes to the earth by way of wire ll. It, therefore, the electrical resistance of the branch comprising the coils 1-' ra be made equal to the joint resistance of the conductors comprising the coils o' r and 1' fr* and the main line L, the effect of an outgoing current will be exactly neutralized .inv each of the twoA electro-magnets.

The electro-magnet R is provided with an armature, c, supported upon the armature-lever A, which is pivoted at c, and provided with an adjustable retractile spring, ai. The free end ot' the armature-lever A normally rests against a back contact-stop, s. A contact-lever, D, is .pivoted at d in such a position that when the arnlaturelever A is' attracted into its forward position toward its electro-magnet R it will impinge upon the end i ofthe contact-lever. A retractile spring, at, normally pulls the contact-lever D in the direction ofthe armature-lever A, against a contact-stop, d, which is so adjusted that when both the armature-lever and the contact-lever are in their extreme backward positions they ITO pole of section e being to earth through wire will remain out of contact with each other,

tensions of the springs a and a?.

but when the armature-lever A is carriedV forward with suiiicient force it will push the contact-lever D from its stop dt and against a limiting-stop, d". The electro-magnet R is likewise provided with an armature, a', carried upon an armature-lever, A", and provided with a contact-stop, s. A retractile spring, a, serves to normally withdraw the armature from its electro-magnet. A contact-lever, D', similar' to the lever D, pivoted at d', is also provided, against which the armature-lever A strikes when drawn toward the poles of its electro-magnet R. Similar contact-stops, di and d, and a retractile spring, c5, are also provided. The relative tensions of the retractile springs c, a, c, and c are so adjusted with reference to the attractive forces of the electro-magnets that a current due to an electro-motive force of, say, fifty volts will be sufficient to overcome the resistance or' the spring fr' and carry the armature -lever A from its back contact stop, s, placing it in contact with the contact-lever D. This current, however, will not be sufficient to overcome the combined tensions of thc springs a* and a, nor to overcome the tension exerted by the spring a3 upon the armature-lever A. A current fromv an electro-motive force of one hundred volts, however, will be sufficient to overcome. the tension of both the springs a* and at, causing the contact-lever D to rest against the contact d", and at the same time to overcoine the tension of the spring c3,- but it will not be sufiicient to overcome the combined A current, however, dueto an electro-motive force of one hundred and fifty volts will be sufficient to overcome the tensions ot all the springs a* and u? and ca and a5, placing the. armature-levers A and A in contact with their respective contact-levers D and D, and the latter in contact with the stops d and d5, respectively. In this manner I am enabled to provide four contacts or sets of contacts, corresponding, respectively, with no current, a current from an electro-motive force of iifty volts, one hundred volts, and one hundred and fifty volts, respectively. It isevident that such currents will actuate the electro-magnets, as before described, only when coming from the main line L.

Two Sounders, registers, or other receivinginstrurnents, N and N', are connected with the armatures and contact-levers of the relays R and Ri', the former of which is designed to respond to currents from au electro-motive force of iii/'ty volts and the latter from a like force of one hundred volts,while both respond to aiorce of onehundred and rftyvolts. The electro-magnet of the receiving-instrurnent X is provided with i'our helices, r, l, rs, and r", the alternate helices being wound in the opposite directions. It is evident that equal currents traversing these coils will oppose and neutralize each other. If, however, any one of the circuits including these helices be ersing the coil r,

interrupted, the effect of thc current passing through the remaining helix of that pair will not be counteracted, and will be manifested bythe magnetization of the core m2, and the consequent attraction exerted upon the armature mi, carried upon an armature-lever, A3. A retractile spring normally holds the armature-lever A3 away from its electro-magnet, but allows it to respond to the magnetization produced in the core mi by an unopposed current traversing one of the coils, r6, r", rg, or r", in the manner ot' an ordinary sounder.

One pole of a local battery, p, is connected by a wire, l8,with both armature-levers A and A', while its opposite pole is connected by a wire, la, with the opposing coils yr and yrl of the receiving-instrunient N, the remaining terminals of which coils are respectively connected bythe wires and 1G with the contactstops s and s. rlhe circuit, therefore, of the battery p normally remains closed through both these helices, the stops s and s', and the armature-levers A and A'. The effects ofthe currents in the coils will, however, be equal and opposite, and the armature m3 will not be attracted. A second local battery, p', is likewise connected by a wire, 17, with the terminals of the remaining pair of helices rs and r", the opposite terminals of which are respectively connected with thc contact-stop d2 by a wire,1S, and the contact-lever D by a wire,l9, which lever is also connected with the opposite pole of the battery p. When, therefore, the contact-lever D is in its normal position, the circuit of the battery p will be closed through both helices r3 and 1', the effects of which are opposite, and will neutralize each other. Thearniature-lever A3 of the receiving-instrument N will therefore remain unaffected.

. Thesecond receiving-instruinent, N, consists of an electro-n1agnet,mf, having but one coil, rw, and provided with an armature and armature-lever, A, oi'ordinary construction. The coil 'rm is included in the circuit of a local battery, p3, the opposite poles of which are respectively connected with the contact-lever D and its contact-stop d5. The circuit of the battery 19' is normally open, but is closed whenever the contact-lever D is placed in contact with the contact-stop d".

The operation ofthe receiving apparatus is as follows: Then currents of any strength are transmitted from the battery-sections e and ef" upon the line L, no effect will be manifested in the electro-magnets Rand R by virtue of their differential construction. ,Vhen, however, a current occasioned by an electro-inotive force of, say, iifty volts is received from the niain line L through the coils fr and r, it will produce in the core m sufficient magnetization to cause the armature-leverAto break its contact with the back-stop s and interrupt the current traversing the coil o. The receiving-instrument N will thereupon respond to the attraction produced by the current travfv'hcu a current from an IOO IIO

electro-motive force of one hundred volts is received from the main line, it will cause both armature-levers A and A to be attracted. The former will rest against the contact-lever D, interrupting the circuit through the coil o, while the latter will not only be drawn from its back contact-stop, s, interrupting the circuit through the coil r, but will also carry the contact-lever D against the contact-stop d5, thus closing the circuit of the battery p through the electro-magnet of the receivinginstrument N. The receiving-instrument N therefore remains inactive, while the remaining receivinginstrument N responds to currents from au electro-motive force of one hundred Volts. Vhen the electro-1notive force of the battery traversing the relay electro-magnets is one hundred and fifty volts, both armature-levers and contactlevers will be carried into their forward position, causing the receiving-instrument N to respond to the iniiuence of the current from the battery p, which then traversesthe coil r only, the circuits of the other three being broken, and the instrument N to respond to the current from the battery p, the circuit of which is complete, as in the instance where a current due to an electro-motive force of one hundredvolts traverses the electro-magnets R and R.

It is well known that the amount of the static accumulation upon a given telegraphline is not uniform, but, on the contrary, varies at different times, in consequence of. changes in the insulation of the conductor, and therefore the force and duration of the discharge-current will be greater at some times than. at others. The actual resistance of the line itself as presented to the battery at the home station also varies from time to time, but not always in proportion to the variation in the static charge; hence it becomes essential, in order to adapt the apparatus to diiferent atmospheric and other conditions, there should be means provided whereby the resistance of the branch line ll and the force and duration of the discharge from the electromagnetic inductor may be regulated independently of each other. In order to accomplish this result, I prefer to construct the induetor substantially in the manner shown in the diagram, Fig. 2, in which the total resistance is made up of a series ot' graduated artif tcial resistances, of which a great-cr or less number may be placed in circuit at pleasure. In the drawings I have shown three such, for the sake of illustration; but I remark that any required number, either greater or less, may be used, as circumstances require.

I prefer, also, to construct the electro-magnetic inductor I in several sections, three of which are shown in the diagram, Fig. 2. The sections are composed of soft-iron cores of dit i'erent lengths, as shown at il', t2, and is. By means of a peg-commutator, Q, of well-known construction, any one or more ofthese inductorsections may be placed in circuit at pleasure,

the length or duration of the charge or dis charge depending upon the length of the particular iron core in circuit, i being the short est, and consequently charging and discharging with the greatest rapidity, While 'i3 is the longest and requires the longest time for its charge and discharge. In like manner the force or intensity of theidischarge may be independently regulated by including a greater or less number of the artificial resistances c', c, and c3 in the circuit.

It is obvious that the capacity of the several ind actor-sections and resistan ees may be graduated or graded with reference to each other, so that any required combination may be etfected, and that the number of sections may be increased to suit circumstances. Y

I claim as my invention-A l. The combination, substantially as hereinbefore set forth, of a main line, an artificial. line, a branch line extending from the junction of the main and artificial lines to the earth, a main battery, a key or transmitter which connects said battery simultaneously to said main, artificial, and branch lines, a receivinginstrument upon which the outgoing currents through the main and branch lines produce an aggregate 'effect which is equal and oppositeA to that of the outgoing current through the artificial line', and an electromagnetic inductor included in the said branch line.

2. The combination, substantially as hereinbefore set forth, of a main line, an artiiicial line, a branch line extending from the junetion of the main and artical lines to the earth, a main battery, a key or transmitter which connects said, battery simultaneously to said main, articial, and branch lines, a receiving-instrument upon which the outgoing currents through the main and branch lines produce an aggregate effect which is equal and opposite to that of the outgoing current through the artificial line, an electro-magnetic inductor included in the said branch line, and means for varying the normal electrical resistance of said branch line. Y

3. The combination, substantially as hereinbefore set forth, of a main line, an artificial line, a branch line extending from the junction of the main and artificial lines to the earth, a main battery, a key or transmitter which connects said battery simultaneously to said main, artificial, and branch lines, a receiving-instrument upon which the outgoing IOC) IIO

currents through the main and branch lines produce an aggregate effect which is equal and opposite to that of the outgoing current through the artificial line, an electro-magnetic induetor included in said branch line, and means for varying the intensity or force ot` the electric discharge from said inductor.

4. The combination, substantially as hereinbefore set forth, of a mainline, an artiiicial line, a branch lline extending from' the junction of the main and articialvlines .to the earth, a mai 11 battery, a key or transmitter which connects said battery simultaneously to said main, artificial, and branch lines, a receivingnstrument upon which the outgoing currents through thc main and branch lines produce an aggregate effect which is equal and opposite to that of the outgoing current through the artificial line, an electrainagnetic inductor included in the said branch line, and means for Varying the length or duration ofthe electric discharge from said inductor.

5. The combinaticn, substantially as hereinbefore set forth, of a main line, an artificial line, a brauch line extending from the junction 0l' the main and artificial lines tothe earth, a main battery, a key cr transmitter for connecting said battery simultaneously to said main, artificial, and branch lines, and a receiving-magnet Wound with two mutual assisting coils and one opposing1 coil, the former 2O being,` respectively included in the main and branch lines, and the latter in the articial line.

In testimony whereof have hereunto subscribed my name this 8th day of August, A. 25 

